Die for curbing chains.



No. 817,618. PATENTED APR.10, 1906.

F. R. BISHOP.

DIE FOR GURBING CHAINS.

APPLIOATION FILED APR.14, 1905.

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. v (fig UNITED STATES PATENT OFFTO.

FREDERICK R. BISHOP, OF SOUTHBRIDGE, MASSACHUSETTS, ASSIGNOR OF ONE-HALFTO ARTHUR S. BISHOP, OF NORTH ATTLEBORO, MAS- SACHUSETTS.

Specification of Letters Patent.

DIE FOR CURBING CHAINS- Patented. April 10, 1906.

Application filed April 14, 1905. Serial No. 255,480.

To all whom, it may concern.-

Be it known that I, FREDERICK R. BISHOP, of Southbridge, in the countyof Worcester and State of Massachusetts, have invented certain new anduseful Improvements in Dies for Curbing Chains, of which the followingis a specification.

The invention relates to means for making a cable-chain into acurb-chain.

The object of this invention is to provide a pair of dies, one fixed andthe other a plunger, each formed with cooperating curbing grooves andguides to enable the chain to be fed lengthwise of the groove in thefixed die and during its travel to be subjected to repeated blows fromthe plunger-die, which give more and more twist or curb to each linkuntil it passes out at the exit end.

The invention consists in forming each die with a double groove with aslight fin between them, each groove being formed of varying depth as itextends from one end to the other, one of the grooves decreasing indepth from the entrance end for a short distance, then increasing indepth for a short distance, then decreasing in depth to the exit end,and the other groove starting with greater depth than thefirst-described groove and decreasing for a short distance, thenincreasing gradually to the exit end, the grooves of the plunger-diebeing made like those of the fixed die as viewed when both have theirfaces upward, thereby making them reverse when the plunger-die is facedown, as it will be when in operation.

The invention will now be fully described and reference had to theaccompanying drawings, and the novel features thereof will beparticularly pointed out in the claims at the close of thespecification.

In the drawings, Figure 1 is a side elevation showing the plunger-dieresting on the lower die. Fig. 2 is a plan of the lower die andguide-plates. Fig. 3 is an end view of the entrance end of the lower diewith guideplate attached. Fig. 4 is an end view of the exit end of thelower die with guide-plate attached. Fig. 5 is a longitudinal sectionthrough the groove on line 5 5 of Fig. 2, the guide-plates beingremoved. Fig. 6 is a longitudinal section on line 6 6 of Fig. 2, theguide-plates being removed. Fig. 7 is a cross-section on line 7 7 ofFig. 2. Fig. 8 is a cross-section on line 8 8 of Fig. 2. Fig. 9 is across-section on line 9 9 of Fig. 2. Fig. 10 is an end view of theentrance end with the plunger-die resting on the stationary lower die.together on line 11 11 of Fig. 1. Fig. 12' is a cross-section of bothdies on line 12 12 of Fig. 1. Fig. 13 is a cross-section of both dies online 13 13 of Fig. 1. Fig. 14 is an end view of the exit end when theplunger-die rests on the lower die. Fig. 15 is a section through thebushing of the entrance guide-plate.

As already stated, the grooves in the fixed die are like the grooves inthe plunger-die; but when the plunger-die is in the inverted position,which it will be when in use, it will bring the deeper groove of one diein opposition to the shallower groove of the other die. A particulardescription of the grooves of one die will therefore ap ly to the other.

A represents the 'xed die,'and B the plunger-die. Figs. 2 to 9,inclusive, specially represent the fixed die A. The bed of the die isformed with two grooves 15 16. There is a slight fin 17 separating thetwo grooves, but at no point rising to the surface of the die. It hasthe general contour of the groove 16, as shown in Fig. 6. 15 iscomparatively deep at the entrance end 18 (see Fig. 6) and inclinesupward for a short distance, and from the upper point 19 it slopesdownward again gradually to the exit end 20 but at the exit end it isstill preferably somewhat shallower than the entrance end. The entrance21 of groove 16 is not so deep as the entrance of groove 15 and risesslightly, then dips down for a short distance. From the point 22 it hasan upward slope gradually to the exit end 23, where it reaches its leastdepth.

For convenience the parts of the plungerdie corresponding with similarparts of the fixed die are designated 15 and 16, and so on.

When the plunger-die is brought down to the fixed die, theentrance-passage will be shaped as shown in Figs. 3 and 10, and theseveral views shown in Figs. 10 to 14, inclusive, show the changingconfiguration of the passage in cross-section.

A guide-plate 24 is screwed to the fixed die on the entrance side,having a hole with a bushing 25 formed with a passage, which may becircular at the outer end, but at the Fig. 11 is a cross-section of bothdies The bottom of the groove inner end should be as shown in Fig. 3 ofshape similar to the shape of the entrance to the passage between thedies. At the exit end there is a guide-plate 26 attached to the fixeddie. The guide-slot 27 may be V- shaped, as shown, but not necessarilyso.

In operation the chain which starts as a cablechain is drawn slowlythrough the guides and grooves of the lower die, while the plunger-dieis made to rapidly reciprocate and hammer the chain on the lower die.The twist in the grooves as the chain is drawn through will give moreand more curb to the links until it passes out at the exit end.

What I claim is 1. A pair of dies for curbing chains, one die beingfixed, and the other a plunger, each die having in its face two parallelgrooves, the grooves in the plunger being similar to the grooves in thefixed die except being in reversed position, each groove being ofvarying depth in itself, and the two grooves vary ing from each other indepth, and a fin between the two grooves of each die which does notextend to the level of the face of the die so that when the faces of twodies are in contact the fins will not contact with each other.

2. A pair of cooperating dies for curbing chains, one die being fixed,and the other a plunger, each die having in its face a groove which isformed in two parallel channels, each channel being of varying depth initself, and each varying from the other in depth, the channels in theplunger-die being like those in the fixed die except in reverse positionrelative to the channels of the fixed die, a fin between the twochannels of each die which does not extend to the level of the face ofthe die, a guide secured to one end of the fixed die having a passageoblong in crosssection, which is in alinement with the passage formedbetween the two dies when they are in contact with each other, toreceive the entering end of the chain.

3. A pair of cooperating dies for curbing chains, one die being fixedand the other a plunger, each die having in its face a groove which isformed in two parallel channels each of varying depth in itself, andeach varying from the other in depth, the channels in the plunger-diebeing like those in the fixed die except in reverse position relative tothe channels of the fixed die, a fin between the two channels of eachdie which does not extend to the level of the face of the die, a guidesecured to one end of the fixed die having a passage oblong incross-section, which is in alinement with the passage formed between thetwo dies when they are in contact with each other, to receive theentering end of the chain, and a guide attached to the exit end of thefixed die having a guide-passage in alinement with the groove in thedie.

4. A pair of dies for curbing chains, each die being formed with twoparallel grooves separated by a fin, the bottom of one of the grooves ineach die decreasing in depth from the entrance end inward for a shortdistance, then increasing in depth, and then decreasing again to theexit end, the second channel decreasing in depth from the entrance endfor a short distance then increasing to the exit end, the depth of bothgrooves being greater at the entrance than at the exit, and one of saidgrooves being of greater average depth than the other, said fin notextending to the surface of the bed, the grooves and fin of one diebeing similar to the grooves and fin of the other die except being inreverse position so that the grooves of differing form will mate witheach other.

In testimony whereof I have afiixed my signature in presence of twowitnesses.

FREDERICK R. BISHOP.

Witnesses:

WILLIAM A. COPELAND, BESSIE G. MoRRIs.

